1 Answer
1

There are a number of factors that determine when autopsy's can be completed instantly.

The first is simply a question of corpse numbers. You need at least this many corpses to receive instant autopsies, and you will need to spend that many corpses to research it at instant speed. If an autoposy is not listed below, it can never be completed instantly (e.g. Advent Officer):

Sectoid - 6

Viper - 5

Muton - 5

Berserker - 5

Archon - 3

Gatekeeper - 3

Andromedon - 4

Faceless - 3

Chyrssalid - 15 (yes, really)

Advent Trooper - 10

Advent Stunlancer - 4

Advent Shieldbearer - 4

Advent MEC - 3

Advent Turret - 3

Sectopod - 3

The second is simpler -- the opportunity for instant research only pops up when you finish a research project. If you Acquire 10 Muton corpses, Instant Muton Autopsies will become available when you next complete a research task (whatever it is).

Do these corpses need to be in my inventory, or do these only need to be collected kills during the course of a campaign? Corpses can be sold to the Black Market, so knowing whether or not I need to hold on to them for instant autopsies would be useful.
– DarthPizzaFeb 9 '16 at 20:39

4

The function that checks for instant research only runs when the research project completes, so they need to be in your inventory.
– Raven DreamerFeb 9 '16 at 23:50